Doubtless, the conscious brain integrates masses of information. But declaring that consciousness simply “emerges” when enough has accumulated, doesn't really explain how first person experience is implemented by neurons. Moreover, empirical observations challenge integrated information theory's (IIT) reliance on thalamo–cortical interactions as the information integrator. More likely, the cortex streams processed information to a still-enigmatic consciousness generator, one perhaps located in the brainstem.

Evidence that central sensitization needs to be maintained in an ongoing manner by nociceptive input from the periphery makes the peripheral drive, rather than the central amplification process, the highest priority target for understanding and control. To stop the peripheral drives to kill two birds with one stone. Moreover, the amplification that central sensitization does provide is selective and not necessarily striking in intensity. A that neutralized central sensitization would probably be less effective in controlling persistent pain than many investigators (...) would like to believe. [berkley; blumberg et al.; coderre & katz; dickenson; mcmahon; weisenfeld-hallin et al.]. (shrink)

Painful stimuli evoke functional activations in the cortex, but electrical stimulation of these areas does not evoke pain sensation, nor does widespread epileptic discharge. Likewise, cortical lesions do not eliminate pain sensation. Although the cortex may contribute to pain modulation, the planning of escape responses, and learning, the network activity that constitutes the actual experience of pain probably occurs subcortically. (Published Online May 1 2007).

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